Guard for circular saws.



No. 818,772. PATENTED APR. 24, 1906. H. D. MELENDY. GUARD FOR CIRCULAR SAWS.

APPLIOATION FILED APR. 2. 1904.

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MELENDY.

GUARD FOR CIRCULAR SAWS.

APPLICATION FILED APR}. 1904.

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HERVEY .D. MELENDY, OF NASHUA, NEl/V HAMPSHIRE.

GUARD FOR CIRCULAR SAWS.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed April 2, 1904. Serial 0 1 To (all whom it may concern:

Be it known that I, HERVEY D. MELENDY, a citizen of the United States, residing at Nashua, in the county of Hillsboro, State of New Hampshire, have invented a certain new and useful improvementin Guards for Circular Saws, of which the following is a specification, reference being had therein to the acco m p anying drawings.

The invention relates to the guards which are used in connection with circular saws for the purpose of preventing a strip of wood which is in process of being sawed from lifting and being driven back by the saw toward the side from which it is being fed.

The invention consists in novel means of connecting the guard-bar with the carrierstrip, by which the latter is supported in its working position, with capacity for ready attachment to and detachment from the said carrier-strip also, in an improved adjustable mounting for the said carrier-strip having capacity for adjustment of the latter universally in a horizontal direction and provided with means for preventing the carrier-strip and guard-bar from becoming twisted or deflected relative to the vertical plane which is occupied by the saw.

I have illustrated my invention in the accompanying drawings, in which Figure 1 is a view on the order of a side elevation with the guard-bar in section on the vertical plane that is indicated by the dotted line 1 1 in Fig. 2. The portion of the worktable which is located at the left in Fig. 2 is omitted from Fig. 1. Fig. 2 is a view, partly in elevation looking from the right-hand side in Fig. 1, but showing in vertical transverse section portions of the work-table and of the beam that is utilized for the support of the guard device. Fig. 3 is an isometric of the stand. 7 Fig. 4 is an isometric of the intermediate plate. Fig. 5 IS an lsometric of the bracket.

Having reference to the drawings, a circular saw is represented at 1, and at 2 is shown the szuv-arbor, the latter being mounted and operated as usual in practice.

The work-table is partly represented at 3 3, the slot within which the saw 1 operates being indicated at 31.

At t is a fixed beam extending parallel with the saw and which I utilize for the attachment and support of my guard device.

The guard-bar is designated 5. At its under side it is formed with a groove 51 to receive the upper portion of the periphery of the saw 1, and in use it ordinarily will be caused to occupy the working relations with respect to the saw in which it is shown in full lines in Fig. 1 of the drawings. The guardbar 5 is carried by a strip 6, of metal, the thickness of which is approximately that of the saw 1 in order that the said strip may enter the cut or kerf that is made by the saw in the stock being operated upon. The attachment of the guard-bar 5 to the carrier-strip 6 is effected in conformity with my invention by slitting the rear end of the guard-bar vcrti cally, as at 52, the slit extending in the direction of the length of the guard-bar a distance somewhat greater than the width of the carrier-strip 6 and the width of the slit being sullicient to accommodate the thickness of the upper end of the carrier-strip. To the slitted rear end of the guardbar 5 are applied a pin 53 and a bolt 54. The said pin and bolt extend transversely through the two side portions of the said end of the guard-bar and cross the slit. They are located at a distance apart from each other in the direction of the length of the guard-bar that is somewhat less than the width of the carrier-strip. A notch 61 is formed in the front edge of the carrierstrip adjacent the upper end of the latter, and a somewhat deeper notch 62 is formed in the rear edge of the carrier-strip. From the notch 61 to the upper end of the carrier-strip the front edge of the latter is removed, so that the distance from the inner end of the notch 62 to the upper front corner of the carrier-strip is a little less than the distance between the pin 53 and bolt 54.

In applying the guard-bar to the carrierstrip the guard-bar is held in an obli ue position substantially like that which is indicated in dotted lines in Fig. 1, and its rear end is lowered relative to the carrier-strip in such manner as to cause the upper end of the latter to enter the slit 52. A forward movement then communicated to the guard-bar carries the stem of the bolt 54 into the notch 62 at the rear edge of the carrier-strip until such stem makes contact with the inner end of the said notch. This forward movement carries the stem ofthe pin 53 to the front of the forward corner at the top of the guardstrip, which leaves the guard-bar free to be swung down until the pin 53 strikes the for wardly-projecting portion of the lower side of the notch 61. This will occur when the guard-bar occupies the plane of the full-line the threaded opposite end of the bolt is apadjusted up or down as may be necessary to plied the nut 55, Fi 2, between which and the exterior side of tie adjacent side portion of the guard-bar is located a washer 56. By means of the said nut and bolt the side portions of the guard-bar may be drawn toward each other against the opposite sides of the carrier-strip 6, so as by frictional engagement between the said side portions and the said carrier-strip to prevent the guard-bar from having movement relative to the carrier-strip until the nut 55 is loosened. After loosening the nut the guard-bar may readily be detached from the carrier-strip by drawing the guard-bar forward until the pin 53 is carried out from under the upper side or wall of the notch 61, then raising the forward end of the guard-bar until the pin 53 has been elevated above the front corner of the carrierstrip, and then pushing the guard-bar rearwardly to cause the stem of the bolt 54 to pass out of the notch 62. The described means of connecting the guard-bar to the carrier-strip enables the former to be connected quickly and conveniently to the latter and as readily disconnected therefrom and removed. While the parts are connected together and the nut and bolt hold the opposite side portions compressed upon the' carrier-strip, the guard-bar is held securely in the desired position without liability to turn accidentally in the vertical direction with relation to the carrier-strip 6.

Below the slot 31 in the work-table 3 the lower portion of the carrier-strip 6 is applied to the vertical portion or body of a stand 7. The said body of the stand is formed with vertical flanges or lips 71 71, which are spaced at a sufficient distance apart to receive the width of the carrier-strip between them. By the engagement of-the said lips or flanges with the edges of the carrier-strip the carrier-strip is prevented from turning movement edgewise. The carrier-strip is attached to the body of the stand 7 by means of a clamping-plate 731 and a bolt 72 and nut 7 3, the carrier-strip being formed with a vertical slot 63 therethrough through which the stem of the bolt 72 passes, the said slot enabling the carrier-strip and guard-bar 5 to be place the guard-bar in the proper position with relation to the upper portion of the periphery of the saw 1; The stand 7 is provided with a horizontal portion or foot 74. This rests upon a plate 8, which in turn rests upon the horizontally-extending top 91 of a bracket 9, that is secured, by means of bolts 92 and nuts 93, to the beam or bar 4 or other convenient fixed part of the framing of the machine in which the invention is employed. The base 74 of the stand 7, the plate 8, and the top 91 of the bracket 9 are all fastened together by means of the clamping-bolt 10 and the nut 101, which is applied to the threaded stem of the said bolt.

I prevent the carrier-strip and guard-bar from becoming twisted or deflected relative to the vertical plane which is occupied by the saw by providing means to render it impossible for the stand 7 to become partially turned horizontally relative to the bracket 9. Thus the plate 8 is formed at its under side with downwardly-projecting marginal portions 81 81, (shown in Figs. 1 and 4,) which receive between them the raised intermediate portion of the top 91 of the bracket 9. The portions which thus fit together extend in a direction parallel with the axis of the saw-arbor 2 and serve to guide the plate in being moved upon the said top in such direction. To permit of such movement, said top 91 is formed with a slot 96, extending parallel with the said saw-arbor, and through which the stem of the clamping bolt 10 passes. Thereby adjustment of the plate and the stand mounted thereon in the direction mentioned is rendered possible in order to enable the carrier-strip 6 to be placed properly in the same plane with the saw. The upper side of the plate 8 is formed with marginal upwardly-projecting portions 82 82, extending at right angles to the axis of the saw-arbor, as shown in Figs. 2 and 4, these upwardly-projecting portions receiving between them a downwardly-projecting intermediate portion on the under side of the foot 74 of the stand 7. The said foot is formed with a slot 75, extending at right angles to the axis of the saw-arbor 2, through which the clamping-bolt 10 passes, the said slot permitting the stand to be adjusted upon the said plate in the direction toward and from the axis of the saw-arbor. The interengaging portions of the foot 74 and the plate guide the stand in being thus adjusted. It will be clear that after the desired position has been given the stand 7, carrier-strip, and guardbar by adjustment of the stand upon the plate or of the plate upon the bracket or by means of both of these adjustments conjointly the said parts will be held securely in such position. I claim as my invention 1. In a guard for circular saws, the combination with a circular saw, a horizontally-extending guard-bar, an upright carrier-strip having the said guard-bar detachably mounted upon its upper end, and formed with a longitudinal slot, a stand 7, the bolt passing through the said slot and securing the carrier-strip to the said stand, the bracket 9, the plate 8 intervening between the said stand and bracket and in sliding engagement with each of the latter to prevent turning movement of one part with relation to another, the stand being adjustable upon the plate and the plate adjustable upon the bracket in directions at right angles to each other, and the clamping-bolt 10.

2. In a guard for preventing the strip being sawed from being driven back by the saw, the combination with a circular saw, and a fixed support, of the upright carrier-strip having in its upper end the notches 61 and 62 opening at the front and rear edges thereof, respectively, the horizontally-extending guard-bar formed at its rear end with the slit receiving the said upper end of the carrier strip and provided with the pin 53 and bolt 54 entering, respectively, the respective notches, the said bolt operating to clamp the slitted portion of the guard-bar upon the carrier-strip, the stand 7, the bolt securing the lower end of the carrier-strip to the said stand, the bracket 9, the plate 8 intervening between the said stand and bracket and in sliding engagement with each of the latter to prevent turning movement of one part with relation to another, the stand being adjustable upon the plate and the plate adjustable upon the bracket in directions at right angles to each other, and the clamping-bolt 10.

In testimony whereof I a'll'ix my signature in presence of two witnesses HERVEY D. MELENDY. Witnesses:

CHAs. F. RANDALL, VILLIAM A. COPELAND. 

